[MS-ASCMD]: ActiveSync Command Reference Protocol Specification

time that the server waits before issuing a response is called the heartbeat interval. For more details
about the HeartbeatInterval element, see section section 2.2.3.75.1.
To reduce the amount of data sent in a Ping command request, the server caches the heartbeat
interval and folder list. The client can omit the heartbeat interval, the folder list, or both from
subsequent Ping requests if those parameters have not changed from the previous Ping request. If
neither the heartbeat interval nor the folder list has changed, the client can issue an empty Ping
request – one with no XML body. The server will use the previously cached XML sent by the client if
it receives an empty Ping request.
If the Ping element (section 2.2.3.116) is specified in an XML request body, either the
HeartbeatInterval element or the Folders element (section 2.2.3.66) or both elements MUST be
specified.
The Ping namespace is the primary namespace for this section. Elements referenced in this section
that are not defined in the Ping namespace use the namespace prefixes defined in section 2.2.1.
The following table lists the elements that are used in Ping command requests and responses.
Element Scope Reference
Ping Request and Response section 2.2.3.116
HeartbeatInterval Request and Response section 2.2.3.75.1
Folders Request and Response section 2.2.3.66
Folder Request and Response section 2.2.3.62
Id Request section 2.2.3.76
Class Request section 2.2.3.26.3
Status Response section 2.2.3.152.10
MaxFolders Response section 2.2.3.86
2.2.2.11.1 Request
A Ping command can be sent with no body, in which case the cached version is used. This XSD
[XMLSCHEMA1] is applied only to requests with a body.
[MS-ASCMD] — v20110315
ActiveSync Command Reference Protocol Specification
Copyright © 2011 Microsoft Corporation.
Release: Tuesday, March 15, 2011
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